398 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



At the time of my first report (Friedmann, 1949a, p. 141) I knew of 

 only two instances of the bar-throated warbler (Apalis thoracicus 

 thomcicus) being parasitized. This numl^cr may now be increased as 

 a result of observations by Skead (1952, p. 12), who found one such 

 case in December 1946 and two more in January 1947. 



The long-billed crombec {Sylmetta rujescens transvaalensis) was 

 previously known as a victim of this cuckoo on the basis of a single 

 case. To this may be added another quite unusual one. Mr. O. P. M. 

 Prozesky informed me when I was in the Transvaal that on Dec. 27, 

 1950, at Buffelspoort, 50 miles northwest of Pretoria, he found a pair of 

 crombecs feeding two fledgling Klaas's cuckoos. 



Another host previously known from one record and for which a 

 second has now come to my attention is the gray-backed bush warbler 

 (Camaropfera brevicaudata abessinica). Sir Charles F, Belcher Avrites 

 me that he found a parasitized nest of this bird in Kenya Colony. 

 The warbler had deserted it. 



The tawn3'--flanked longtail, Prinia mistacea (subsp. melanor- 

 hyncha), was knovv^ to be victimized in the Gold Coast. Its eastern 

 race, immutabilis, has since been found to be similarly affected in 

 Kenya Colony, where Stoneham (1952, p. 7) found a nest at Kitale 

 with three eggs of the longtail and one egg of Klaas's cuckoo. 



Skead's (1954, p. 87) recent study of the greater double-collared 

 sunbird has added six more instances of its usage as a victim by 

 Klaas's cuckoo. It must be regarded as one of the chief hosts of the 

 parasite in the Cape Province. 



The East African mouse-colored sunbird (Chaleomitra veroxii 

 jischeri) has been found to act as a host for Klaas's cuckoo in Kenj^a 

 Colony by Belcher (in litt.). I had previously listed it as such in 

 northern Zululand, but it now seems that the latter record refers to 

 the nominate race of the sunbird. 



Cinnyris venustus jalkensteini may be added to the known hosts of 

 Klaas's cuckoo, as Mackworth-Praed and Grant (1955, p. 779) record 

 it as being occasionally parasitized in East Africa. Previously I had 

 known of only a single instance, involving the Abyssinian race Cinnyris 

 venustus fazoqlensis (Friedmann, 1949a, p. 143). 



The Kenya rufous sparrow (Passer iagoensis rufocinctus) is an 

 addition to the recorded victims of Klaas's cuckoo. Belcher (1949b, 

 p. 19) mentions, without further details, that he has in his collection 

 eggs of Klaas's cuckoo taken from a nest of this sparrow. I under- 

 stand from correspondence that there were two eggs attributed to the 

 cuckoo in this nest and that the identification of the parasite is not 

 really definite. 



Chapin (1954, p. 339) records the masked weaver ■ (P/oce^(5 inter- 

 medius intermedius) as a host of Klaas's cuckoo on the strength of two 



